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This is the famous Brunton Compass designed by D. W. Brunton, a Colorado mining engineer.
After obtaining a patent for his new compass in 1894, Brunton soon had a compass that was widely used throughout
the world in only a matter of a few years.
Brunton's patent has long since expired, and now other high-quality and low-cost pocket transits have
been introduced to the market.
Even so, many geologist's regard the Brunton Compass as their most trusted tool, combining the
principles of the surveyor's compass, prismatic compass, clinometer, hand level, and plumb.
When the compass is unfolded it produces two sights with peepholes.
You have the option to sight through a clear window in the lid or lay the lid completely open and use the second
hinged peep sight.
The interior of the cover features a mirror with a vertical line inscribed.
This F5006LM Brunton Pocket Transit features increased reliability due to a single NdFeB magnet that functions
to resist demagnetization better than many other types of magnets.
To obtain fast and highly accurate readings the compass needle is an induction damped needle and has a sapphire
jeweled bearing.
The compass rose is found on the perimeter of the face and the interior of the compass rose has two spirit
levels and a movable scale for use as a pocket transit.
To adjust your local magnetic declination angle (the difference between true north and magnetic north)
there is a slotted screw on the outside of the case that turns a gear and
rotates the entire compass rose.
When the lid of the compass is closed, it engages a needle lift mechanism that
protects the jeweled bearing when carrying the compass.
You can take an altitude angle measurement by turning the compass on its side and adjusting the spirit level
(while viewing the spirit level using the mirror hinged at 45-degrees).
This model F5006LM is accurate to 1/2 degree in azimuth, and has a 10 arcminute resolution for vertical angles.
We are proud to say the Brunton Pocket Transit is still made in the United States and includes a one-year
warranty.
The compass measures 2 3/4 inches (7 cm) by 3 1/16 inches (7.8 cm), is 1.25 inch (3.2 cm) thick, and weighs
6.5 ounces (184 grams).
The F5006LM has a National Stock Number of NSN 6675-01-127-8394.
The list price for the F5006LM Brunton Compass with leather case is $538, but we are offering it for only $449.
The optional Brunton Ball and Socket Tripod Mount is a must for high accuracy readings.
This exclusive mount fits all Brunton transits and is adjustable for both azimuth and vertical angle measurements.
The Brunton Ball and Socket Tripod Mount is precision manufactured using non-magnetic aluminum and brass materials.
The Ball and Socket Tripod Mount with standard 1/4 - 20 threads has a National Stock Number of NSN 6675-00-799-2963.
The optional Brunton Ball and Socket Tripod Mount weighs 4.4 ounces (125 grams) and normally $88,
but we offer it for only $60.